Re: iDEFENSE Security Advisory 08.09.05: AWStats ShowInfoURL Remote Command Execution Vulnerability

["Laurent Destailleur (Eldy)" <eldy () users sourceforge net>]

Martin Pitt wrote:

> Hi Laurent, hi iDEFENSE!
>
>  
The eval function still exists, however parameters inside has been 
sanitized, this explain the known exploits does not works any more now. 
However, may be there is still a way to crack this (despite sanitizing) 
but i can't "see" how for the moment.
To be sure, i decided to completely remove the "eval" function with 6.5 
that is in beta but i consider 6.4 safe (until a way to hack the 
sanitizing is found).

> iDEFENSE Labs [2005-08-09 12:24 -0400]:
>  
>
> > Shown as follows, the $url parameter contains unfiltered user-supplied 
> > data that is used in a call to the Perl routine eval() on lines 4841 
> > and 4842 of awstats.pl (version 6.4):
> >
> >     my $function="ShowInfoURL_$pluginname('$url')";
> >     eval("$function");
> >    
>
> Thanks for spotting this. Also, please note that you correctly state
> that this vulnerable code is from 6.4
>
>  
>
> > iDEFENSE Labs has confirmed the existence of this vulnerability in 
> > AWStats 6.3. All earlier versions are suspected vulnerable. AWStats 6.4 
> > has been released since the initial research on this vulnerability. 
> > AWStats 6.4 has replaced all eval() statements, and has mitigated the 
> > exposure to this vulnerability.
> >    
>
> 6.4 still contains loads of eval() statements, and still seems
> vulnerable against this flaw, since the quoted code hasn't changed at
> all.
>
>  
>
> > This vulnerability has been addressed with the release of AWStats 6.4.
> >    
>
> As far as I can see, it is not yet fixed even in upstream CVS in
> awstats.pl.
>
>  http://cvs.sourceforge.net/viewcvs.py/awstats/awstats/wwwroot/cgi-bin/awstats.pl
>
> So am I totally confused and somehow this was fixed in a different
> place (although I can't see how)? Or is this not yet fixed at all?
>
> Thanks,
>
> Martin
>
>  


--
Laurent Destailleur.
---------------------------------------------------------------
EMail: eldy () users sourceforge net
Instant messenger: ICQ=89306207, Jabber=Eldy
Web: http://www.destailleur.fr
AWStats: http://awstats.sourceforge.net
CVSChangeLogBuilder: http://cvschangelogb.sourceforge.net
AWBot: http://awbot.sourceforge.net
Dolibarr: http//dolibarr.com

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/